Bug 1685201 - Back out bug 1643204. r=mattwoodrow,smaug

Bug 1643204 really only papered over the issue of the active state being
messed up / the document becoming visible internally without notifying
media.

Bug 1572798 notifies media properly so that the visibility state is
consistent with what media thinks the visibility state is, so I think
there's no longer a reason to do this.

No other browser passes the test added in bug 1643204.

Differential Revision: https://phabricator.services.mozilla.com/D100836

testing/web-platform/tests/html/webappapis/dynamic-markup-insertion/opening-the-input-stream/pageshow-event.window.js

@@ -1,13 +0,0 @@
-async_test(t => {
-  const frame = document.body.appendChild(document.createElement("iframe"));
-  assert_equals(frame.contentDocument.open(), frame.contentDocument);
-  assert_equals(frame.contentDocument.documentElement, null);
-  frame.contentDocument.write("<div>heya</div>");
-  frame.contentDocument.close();
-  frame.contentWindow.addEventListener("pageshow", function() {
-    t.step(function() {
-      assert_true(true, "Got pageshow event");
-    });
-    t.done();
-  });
-}, "document.open(), and the pageshow events");

uriloader/base/nsDocLoader.cpp

@@ -769,17 +769,14 @@ void nsDocLoader::DocLoaderIsEmpty(bool aFlushLayout,
       if (!parent || parent->ChildEnteringOnload(this)) {
         nsresult loadGroupStatus = NS_OK;
         mLoadGroup->GetStatus(&loadGroupStatus);
-
-        // Can "doc" or "window" ever come back null here?  Our state machine
-        // is complicated enough I wouldn't bet against it...
-        nsCOMPtr<Document> doc = do_GetInterface(GetAsSupports(this));
-        if (doc) {
-          // Make sure we're not canceling the loadgroup.  If we are, then just
-          // like the normal navigation case we should not fire a load event.
-          if (NS_SUCCEEDED(loadGroupStatus) ||
-              loadGroupStatus == NS_ERROR_PARSED_DATA_CACHED) {
-            // The readyState change is required to pass
-            // dom/html/test/test_bug347174_write.html
+        // Make sure we're not canceling the loadgroup.  If we are, then just
+        // like the normal navigation case we should not fire a load event.
+        if (NS_SUCCEEDED(loadGroupStatus) ||
+            loadGroupStatus == NS_ERROR_PARSED_DATA_CACHED) {
+          // Can "doc" or "window" ever come back null here?  Our state machine
+          // is complicated enough I wouldn't bet against it...
+          nsCOMPtr<Document> doc = do_GetInterface(GetAsSupports(this));
+          if (doc) {
             doc->SetReadyStateInternal(Document::READYSTATE_COMPLETE,
                                        /* updateTimingInformation = */ false);
             doc->StopDocumentLoad();
@@ -821,19 +818,6 @@ void nsDocLoader::DocLoaderIsEmpty(bool aFlushLayout,
                 }
               }
             }
-          } else if (loadGroupStatus == NS_BINDING_ABORTED) {
-            doc->NotifyAbortedLoad();
-          }
-
-          if (doc->IsCurrentActiveDocument() && !doc->IsShowing() &&
-              loadGroupStatus != NS_BINDING_ABORTED) {
-            nsCOMPtr<nsIDocShell> docShell = do_QueryInterface(this);
-            bool isInUnload;
-            if (docShell &&
-                NS_SUCCEEDED(docShell->GetIsInUnload(&isInUnload)) &&
-                !isInUnload) {
-              doc->OnPageShow(false, nullptr);
-            }
           }
         }
         NotifyDoneWithOnload(parent);